Support new HTTP result types in OpenAPI schema generation

src/OpenApi/src/Services/Schemas/OpenApiSchemaService.cs

@@ -12,6 +12,7 @@
 using System.Text.Json.Schema;
 using System.Text.Json.Serialization.Metadata;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Http.Json;
 using Microsoft.AspNetCore.Mvc.ApiExplorer;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
@@ -58,9 +59,11 @@ internal sealed class OpenApiSchemaService(
         TransformSchemaNode = (context, schema) =>
         {
             var type = context.TypeInfo.Type;
-            // Fix up schemas generated for IFormFile, IFormFileCollection, Stream, PipeReader and FileContentResult
+            // Fix up schemas generated for IFormFile, IFormFileCollection, Stream, PipeReader,
+            // FileContentResult, FileStreamResult, FileContentHttpResult and FileStreamHttpResult
             // that appear as properties within complex types.
-            if (type == typeof(IFormFile) || type == typeof(Stream) || type == typeof(PipeReader) || type == typeof(Mvc.FileContentResult))
+            if (type == typeof(IFormFile) || type == typeof(Stream) || type == typeof(PipeReader)
+                || type == typeof(Mvc.FileContentResult) || type == typeof(Mvc.FileStreamResult) || type == typeof(FileContentHttpResult) || type == typeof(FileStreamHttpResult))
             {
                 schema = new JsonObject
                 {

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Extensions/JsonTypeInfoExtensionsTests.cs

@@ -64,6 +64,9 @@ public class Baz
         [typeof(Stream), "Stream"],
         [typeof(PipeReader), "PipeReader"],
         [typeof(FileContentResult), "FileContentResult"],
+        [typeof(FileStreamResult), "FileStreamResult"],
+        [typeof(FileContentHttpResult), "FileContentHttpResult"],
+        [typeof(FileStreamHttpResult), "FileStreamHttpResult"],
         [typeof(Results<Ok<TodoWithDueDate>, Ok<Todo>>), "ResultsOfOkOfTodoWithDueDateAndOkOfTodo"],
         [typeof(Ok<Todo>), "OkOfTodo"],
         [typeof(NotFound<TodoWithDueDate>), "NotFoundOfTodoWithDueDate"],

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Services/OpenApiSchemaService/OpenApiSchemaService.ResponseSchemas.cs

@@ -7,6 +7,7 @@
 using System.Text.Json.Nodes;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
 
 public partial class OpenApiSchemaServiceTests : OpenApiDocumentServiceTestBase
@@ -1055,6 +1056,75 @@ await VerifyOpenApiDocument(builder, document =>
         });
     }
 
+    [Fact]
+    public async Task GetOpenApiResponse_HandlesFileStreamResultTypeResponse()
+    {
+        // Arrange
+        var builder = CreateBuilder();
+
+        // Act
+        builder.MapPost("/filestreamresult", () => { return new FileStreamResult(new MemoryStream(), MediaTypeNames.Application.Octet); })
+            .Produces<FileStreamResult>(contentType: MediaTypeNames.Application.Octet);
+
+        // Assert
+        await VerifyOpenApiDocument(builder, document =>
+        {
+            var operation = document.Paths["/filestreamresult"].Operations[HttpMethod.Post];
+            var responses = Assert.Single(operation.Responses);
+            var response = responses.Value;
+            Assert.True(response.Content.TryGetValue("application/octet-stream", out var mediaType));
+            var schema = mediaType.Schema;
+            Assert.Equal(JsonSchemaType.String, schema.Type);
+            Assert.Equal("binary", schema.Format);
+        });
+    }
+
+    [Fact]
+    public async Task GetOpenApiResponse_HandlesFileContentHttpResultTypeResponse()
+    {
+        // Arrange
+        var builder = CreateBuilder();
+
+        // Act
+        builder.MapPost("/filecontenthttpresult", () => { return TypedResults.File([], MediaTypeNames.Image.Png); })
+            .Produces<FileContentHttpResult>(contentType: MediaTypeNames.Image.Png);
+
+        // Assert
+        await VerifyOpenApiDocument(builder, document =>
+        {
+            var operation = document.Paths["/filecontenthttpresult"].Operations[HttpMethod.Post];
+            var responses = Assert.Single(operation.Responses);
+            var response = responses.Value;
+            Assert.True(response.Content.TryGetValue("image/png", out var mediaType));
+            var schema = mediaType.Schema;
+            Assert.Equal(JsonSchemaType.String, schema.Type);
+            Assert.Equal("binary", schema.Format);
+        });
+    }
+
+    [Fact]
+    public async Task GetOpenApiResponse_HandlesFileContentStreamResultTypeResponse()
+    {
+        // Arrange
+        var builder = CreateBuilder();
+
+        // Act
+        builder.MapPost("/filestreamhttpresult", () => { return TypedResults.File(new MemoryStream(), MediaTypeNames.Application.Pdf); })
+            .Produces<FileStreamHttpResult>(contentType: MediaTypeNames.Application.Pdf);
+
+        // Assert
+        await VerifyOpenApiDocument(builder, document =>
+        {
+            var operation = document.Paths["/filestreamhttpresult"].Operations[HttpMethod.Post];
+            var responses = Assert.Single(operation.Responses);
+            var response = responses.Value;
+            Assert.True(response.Content.TryGetValue("application/pdf", out var mediaType));
+            var schema = mediaType.Schema;
+            Assert.Equal(JsonSchemaType.String, schema.Type);
+            Assert.Equal("binary", schema.Format);
+        });
+    }
+
     [ApiController]
     [Produces("application/json")]
     public class TestController